Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
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Boom Actuator Service (Machines with Serial Numbers Above 260000000)<br />
IMPORTANT: Do not dismantle, repair or modify the<br />
boom actuator. Internal components are not available<br />
for the actuator. If an actuator is damaged or<br />
worn, replace actuator.<br />
CAUTION<br />
During and after operation, the actuator may be<br />
very hot. To avoid possible burns, allow the actuator<br />
to cool before working on it.<br />
Actuator Circuit <strong>Pro</strong>tection<br />
Each boom actuator is protected internally by a thermal<br />
circuit breaker. In case of actuator overheating, the thermal<br />
breaker will trip, causing the actuator to cease functioning.<br />
Once the actuator cools to appropriate<br />
operating temperature, the actuator thermal breaker will<br />
reset to allow actuator operation to resume.<br />
A separate 30 amp thermal breaker also protects each<br />
boom actuator circuit. These thermal breakers are located<br />
at the machine fuse panel and will prevent circuit<br />
operation if overloaded. The thermal breakers reset automatically.<br />
Actuator Freeplay Inspection<br />
Over time, actuator operation may be affected by air<br />
captured in the reservoir oil. An excessive amount of air<br />
in the actuator oil will allow excessive actuator freeplay.<br />
Excessive freeplay will allow spray boom bouncing<br />
when driving over severe terrain.<br />
Measure actuator freeplay using the following procedure:<br />
1. Move the vehicle to an open area and lower the spray<br />
booms to the spray position.<br />
2. Lift up on the boom at the last triangular gusset with<br />
a 25 pound (11.4 kg) force. Support boom in that position.<br />
3. Using a non–permanent felt tipped marker, mark the<br />
cylinder rod at the outside of the cylinder seal.<br />
4. Release the spray boom and allow it to return to the<br />
spray (fully lowered) position.<br />
5. Determine the actuator freeplay by measuring the<br />
distance from the mark on the cylinder rod to the cylinder<br />
seal. The freeplay should be less than 0.100” (2.5 mm).<br />
If excessive freeplay is found, bleed air from actuator.<br />
Actuator Air Bleeding<br />
If actuator freeplay is excessive, air bleeding of the actuator<br />
should be performed using the following procedure:<br />
1. Thoroughly clean the exterior of actuator to prevent<br />
contaminates from entering the actuator.<br />
2. Make sure that the actuator cylinder is fully retracted.<br />
IMPORTANT: To prevent actuator damage, use vise<br />
with protective jaws when clamping actuator.<br />
3. Place the actuator in a vise making sure that actuator<br />
is clamped in the area identified in Figure 49. Use just<br />
enough clamping force to hold the housing securely.<br />
Make sure that the reservoir plug is orientated up.<br />
CAUTION<br />
The actuator reservoir is pressurized. If the reservoir<br />
plug is removed too quickly, oil under<br />
pressure can be ejected from the actuator.<br />
4. Slowly loosen and remove the reservoir plug at the<br />
top of the reservoir.<br />
5. Using a light through the plug hole, confirm that the<br />
reservoir oil is clear. If the oil appears milky, air is entrained<br />
in the reservoir oil. Keep the actuator vertical<br />
with the plug removed for approximately 15 minutes to<br />
allow the air to separate from the oil.<br />
6. When oil appears clear, use a 12 volt DC power supply<br />
to power the actuator and extend the cylinder completely.<br />
IMPORTANT: To ensure proper reservoir pressure,<br />
make sure that cylinder is extended before installing<br />
reservoir plug.<br />
7. Install the reservoir plug and torque from 45 to 60 in–<br />
lb (5.1 to 6.8 N–m).<br />
8. If reservoir oil was milky, use power supply to contract<br />
and extend the actuator cylinder 3 times. Repeat<br />
steps 2 through 7 until oil is clear.<br />
9. When actuator oil is clear and plug has been<br />
installed, use power supply to fully contract the actuator<br />
cylinder. Remove actuator from vise and install on machine.<br />
Spray System Page 6 – 48 Rev. A <strong>Multi</strong> <strong>Pro</strong> <strong>5700</strong>–D